Band-saw.



. J. BLUM.

BAND SAWK APPlICATION FILED DEL'. I6. 1915.

patented July 17, 1017.

B'SHEETs--SHEU l.

(5,1. BLUM.

BAND SAW.

APPLlcATlON FILED DEC. 16. 1915.

Patented July 17, 1917.

3 SHEETS-SHEET 2.

/7 G60/y@ IBM.

(3.1. BLUM.

BAND SAW.

APPLICATION FILED DEC.16. 1915. I

Patented July 17, 1917.

3 S'HEETS-SHEET 3.

STATE@ FTFFVF OFFIFF.

GEORGE J'. BLUM, OF CHICAGO, ILLINOIS, ASSIGNOR TO ARMSTRONG-BLUM MANUFAC- TURIN G COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BAND-SAW.

Application filed December 16, 1915.

To all whom t may concern."

Be it known that I, GEORGE J. BLUM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Band-Saws, 4of which the following is a specification.

This invention relates particularly to band saws intended for use in sawing metal, but certain features of the invention may have useful application to the sawing of other material. v

One of the objects of this invention is to provide an improved pivotal mounting of the saw-supporting frame.

Another object is to improve the means for transmitting power to the band wheels in any position of the latter.

A further object is to provide means for feeding the saw-supporting frame toward the work and for returning said frame to initial position.

A further object is to provide means for deiiecting or guiding the saw blade into the desired plane.

A further object is to provide means for adjusting one of the band wheels with relation to the plane of the other band wheel to enable the saw blade to run properly upon the wheels.

In the accompanying drawings Figure 1 is a plan view ofthe bed of a machine embodying the features of my invention, the sawcarrying frame being shown in section. Fig. 2 is a transverse vertical sectional view taken in the plane of dotted line 2 2 of Fig. 1. Fig. 3 is a vertical sectional view taken in the plane of dotted line 3 of Fig. 2. Fig. 4 is a detail view of one of the saw guides. Fig. 5 is a section on dotted line of Fig. 4. Fig. 6 is a side elevation of ing the table. Fig. 14 is a view showing an` adjustable support for one of the band wheels. Fig. 15 is a detail view of a portion of the clutch shown in Fig. 13.

The embodiment herein shown of my in- Specication of Letters Patent.

Patent-,ea .nay iv, miv.

Serial No. 67,135.

vention comprises a bed or table 1 (Fig. 1) having a saw slot 1a and provided with suitable means for attaching the work thereto. Herein l have shown four T-slots 2, 3, 4, 5 adapted to receive any ordinary or preferred work-holding devices.

The endless saw blade 6 is mounted upon the wheels 7 and S (Fig. 6). These wheels are carried by a frame comprising a column 9 and two arms 10 and 11 fixed to said column. The wheel `7 is adjustably supported upon the arm 10 by any suitable means, for movement toward and away from the other wheel.

T he saw-carrying frame is tiltably mounted upon a rectangular carriage 12 (Figs. 1 and 2) which is provided with supporting rollers 13 that run in two parallel grooved guides 14. Side movement of the carriage 12 is prevented by rollers 15 that run in contact with the guides 14.

Rigiolly connected to the column 9 is a friction drum 1G (Fig. 9) which is rotatably supported within a split collar 17 fixed to the carriage 12. A. bolt or screw 18 permit-s of drawing up the collar 17 so as to clamp the drum 16 and thus hold the saw-carrying frame at any angle to which the latter may have been adjusted. The forward end of the arm 11 is provided with a Curved flange 19 (Fig. 3) which is supported within a grooved guide 2O (Figs. 2 and 3), the latter beingl fixed to the carria e 12.

rlhe pivotal centers o the drum 16 and curved flange 19 are in the axis of the main drive shaft 21 (Fig. 9). Said shaft is mounted in a sleeve 22 which is rotatably supported in bearings 23 and 24 on the bed of the machine. In the shaft 21 is a keyway 25 to receive a spline 26 by means of which 'the shaft 21 is caused to rotate with the sleeve 22.` The shaft 21 is arranged to slide with the carriage 12, the keyway 25 being of sutiicient length to permit the necessary amount of sliding movement. The sleeve carries a loose pulley 27 and a tight pulley 28. As these pulleys lie between the bearings 23 and 24, the sleeve 22 is held against endwise movement.

Fixed upon the shaft 21 iS a flange 29 which is rigidly secured to a stepped pulley 30. said pulley being rotatably mounted upon a stub shaft 31 fixed to the drum 16 in alinement with the shaft 21. It will be seen that. when the carriage 12 is slid back and forth, the shafts 21 and 31 also will be slid. A belt 32 communicates power `from the stepped pulley 30 to a similar pulley 33. 32 a is a slack-take-up pulley. The pulley 33 is fixed upon a shaft which is'journaled in the lower end of the sawsupporting frame. Said shaft carries a bevel pinion 34 (Fig. 1) that meshes with bevel. gear teeth 35 (Fig. 10) attached to the lower band wheel 8. It will be seen that the lower band wheel may be driven in any position of the carriage 12 and in any tilted position ot the saw-carrying frame.

` Any suitable means may be employed for reciprocating the carriage 12. Herein I have shown a shaft 36 (Figs. 1 and 13) carrying two oppositely grooved winding drums 37 and 38. To the winding drum 37 is connected a cable 39 which is attached to the front end of the carriage 12. 40 is a. cable arranged to be wound upon the drum 38, one end of said cable being connected to the rear end of the carriage 12 and running intermediately vover a. guide sheave 41. 1t will be seen that when the shaft 36 is rotated. the carriage 12 will he moved forward or back, depending upon the direction of rotation ot' the shaft. To the outer end of the shaft 36 is fixed a hand-wheel 42 by means of which the carriage 12 may be manually returned to initial position after the completion of a eut.

Any suit-able power means may be employed to feed the carriage 12. Herein is shown a shaft 43 (Figs. 1 and 6) carrying at its rear end a pulley 44 which is driven by means ofv a belt 45 extending over the projecting end of the sleeve 22. n the forward end of the shaft 43 is a worm 46 (Fig. 13) that meshes with spiral teeth formed in the periphery of an annular member 47. The annular member 47 comprises a web 48 that carries an annular series of friction blocks 49. These blocks may be of cork or any other suitable material. At opposite sides of the web 48 are disks 50 and 51. The disk 50 is fixed to the shaft 36, while the disk 51 is slidable longitudinally of the shaft, but is caused to rotate with the shaft by means of a pin 52 extending through notches 53 in the hub of the disk 51. 54 is an adjusting nut mounted upon a screwthreaded portion of the shaft 36. Between the nut 54 and the disk 5l is a compression spring 55 by means of which the friction blocks 49 are clamped between the disksv 50 and 51. The 4pressure of the spring 55 may be. adjusted by turning the nut 54. 56 are packing rings to prevent the entrance of oil or dirt to the space between the disks 50 and 51.

The front end of the shaft 43 is journaled in one arm of a lever 57 (Figs. 1() and 11). The lever 57 is pivoted at 58. In the other arm of the lever 57 is mounted a rockshaft 59 carrying an eccentric stud 60 (Fig. 12). The stud 60 lies within an opening in a` link 61 which is pivoted at 62. Fixed to the rock-shaft 59 is a handle 63 by means of which the shaft 59 may be manually rocked to tilt the lever 57 and thereby move the worm 46 into and out of mesh with the member 47.

Suitable means may he provided for automatically stopping the machine upon the completion of a cut. Ilerein T have shown a tripping projection 64 (Figs. 1 and 2) fixed to the carriage 12 and arranged to engage an arm 65 adjustably mounted upon a rock-shaft 66 carried by the bed of the machine. 0n the front end of the rock-shaft is a non-circular member 67 (Fig. 10) underlying the adjacent end of a lever 68. Said lever is pivoted at 69 and one end thereof is adapted to enter a groove 70 (Fig. 1) in a shifter rod 71. To the shifter rod is fixed the belt-engaging fork 72 (Fig. 1). A coiled spring 73 interposed between the machine frame and a collar on the shifter rod moves the shifter rod longitudinally to place the belt'on the loose pulley 27 as soon as the lever 68 is disengaged from the groove 70. On the forward end of the shifter rod is a handle 74 by means of which the operator may shift the belt onto the tight pulley. The lever 68 is provided with a` handle. 75 by means of which the shifter rod may be manually released whenever it is desired to stop the machine. The arm 65 may be set at any desired point along the rock-shaft 66 in order to regulate the length of the feed movement of the carriage 12.

To deflect the operating portion of the saw blade 6 into the plane of mevement of the carriage 12, I provide two similar guides 76` one above and the other below the work. The lower guide is illustrated in detail in Figs. 4 and 5` where it will be seen that the guide comprises two rollers 77 and 78. each rotatably mounted upon a plate 79.l The plates 79 are pivoted at 8O to a support 81. An adjustable stop 82 holds the roller 77'in desired position. 83 is an adjustingl screw by means of which the roller 78 may be adjusted to holdI the saw blade firmly against the roller 77. The roller 77 is provided with a. peripheral tiange. 84 (Fig. 5) which runs in a groovey 85 in the roller 78 and provides a stop for the rear edge of the saw blade.

One of the saw guides just described is located just below the top of the table 1. The other is fixed to a bar 86 (Fig. 6) which is carried by the arm 10 for vertical adjusting movement.. The bar 86 may be secured in any desired position by suitable means, as a. clamping bolt 87. )Vhen the upper saw guide is lowered. the lower end of the bar 86 may be steadied by means of a bolt passed through an opening 88 in an arm 89, the lat- 'ter being movably fixed to the column by The saw guides 76 may be removed and the power feed thrown out in case it is desired to feed Work by hand against `the saw in a direction at a right angle to the power feed movement.

I have provided. means for adjusting the plane of the band wheel 7 with relation to the plane of the other band wheel, as may be necessary to cause the saw band 6 to run true and remain upon the wheels. This means is shown in Fig. 14. The wheel 7 is rotatably mounted upon a pivot 92 which is pivoted at 93 in the saw-supporting frame. An adjusting screw 94 bearing against the end of the' pivot 92 opposite to the end which carries the band wheel constitutes means for tilting the pivot so as to place the band wheel in the plane 'required for the proper running of the saw blade.

While any ordinary or desired means may be employed to secure the work to the table 1, l have shown in Figs. 6, 7 and 8, a preferred form of work-holder Comprising a` body 95 having two ribs 96 and 97 adapted toproject into either-of 'the grooves 3. The undercut walls of lsaid grooves are provided with V-shape notches 98. A block 99 ex tends freely through an opening 100 in the hodj-vv 95. and is provided at its forward ond with lateral toothed projections 101 an ranged to engage the undercut walls of the groove 3. At its rear end the block 99 has two lateral projections 102 fitting loosely in thelgroove 3. A. screw 103 seated in the upper part of the block 99 is arranged to bear against the surface 104 of the body 95 to clamp the projections 101 against the undercut walls of the groove 3 to lock the work-holder in place and press the body 95 against the Work.

105 (Figs. 1 and 10) is a pump for forcing water or other liquid to the saw blade, said pump being driven by a belt 106. lThe fluid connections for the pump are not shown in the drawings.

Assuming the parts to be in the position shown in Fig. 6, the operation is as follows: The Ibeam a to be. sawed is securedly fastened to the table 1 by any suitable means. Said beam may be out ofi` square or at an angle dependinguj'ion the pivotal adjustment imparted to the saw-supporting frame.

. In Fig. 6, the saw is arranged for a Vertical cut. The operator grasps the handle 74 (Fig. 1) and pulls the shifter rod 71 forward to place the drive belt on the tight pulley 28. As soon as the groove comes into register with the lever 68, said lever moves into the groove and locks the shifter rod. In the rotation of the shaft 36 the carriage 12 is advanced to move the saw 6 through the Work. By the time the saw has passed through the work the projection 64 (Fig. 1) has been moved against the arm 65, causing the shaft 66 to turn and thus raise the adjacent end of the lever 68 (Fig. 10). The other end of the lever 68 is thus withdrawn from the groove 70. whereupon the spring 7 3 moves the rod 7.1 to place the drive belt on the loose pulley 27. The operator then turnsl the handle 63 (Fig. 11) to raise the worm 46 out of mesh with the Worm wheel member 47. By rotating the hand-wheel 42 the operator returns the carriage 12 to initial j'iosition. The work is then removed or shifted in preparation for another cut.

The friction clutch may be adjusted so as to permit more or less slip between the fric` tion blocks 49 and the flanges 50 and 51, depending upon the hardness of the material to be out. lf relatively soft material, or a piece of varying crosssectional area, is being cut, the operator may, if desired. increase the feed speed by rotating the handwheel 42.

l. claim as my invention:

1. A band saw having, in combination, a

frame, two hand wheels carried by said` frame, a saw carried by said Wheels, a carriage on which said frame is pivotally supported, a shaft axially alined withthe pivotal center ofsaid frame, a wheel on said shaft, a wheel having a driving connection with the last mentioned Wheel and one of the band wheels, a drive-shaft axially alined with the other shaft and connected to rotate and slide therewith, and means slidahly connected to saidv drive-shaft for rotating.

'the latter.

2. A band saw having, in combination, a main frame, a carriage movably supported by the main frame, a saw-supporting frame tiltably connected to the carriage, a Saw carried by said frame, means for communieating motion to the saw, said means including a drive-shaft located in the axis of the tilting movement of the saw-supporting frame, a carriage-feeding shaft, a friction clutch through Which power is transmitted from the drive-shaft to the carriage-feeding shaft, and a hand-Wheel on said carriage feeding shaft for rotating the latter.

3. A band saw having, in combination, a main frame, a carriage movably supported by the main frame, a saw-supporting frame tiltably connected to the carriage, a saw carried by said frame, means for communieating motion to the saw, said means including a drive-shaft located in the axis of the tilting movement of the saw-supporting frame, carriage-feeding means driven by said shaft, and manual means for returning the carriage to initial position.

4. A band saw having, in combination, a main frame, a carriage movably supported by the main frame, a saw-supporting frame tiltably connected to the carriage, a saw carried by said frame, means for communixating motion to the saw in any position of the carriage and saw-supporting frame, said means including a drive-shaft located in the axis of the tilting movement of the sawsupporting frame, and carriage-feeding means driven by said shaft.

5. A band saw having, in combination, a main frame, a carriage movably supported by the main frame, a saw-supporting frame tiltably connected to the carriage, a saw carried by said frame, and means for communicating motion to the saw in'any position of the carriage and saw-supporting frame.

G. A band saw having, in combination, two band wheels, a pivot upon which one of the band wheels is rotatably mounted, said pivot being mounted to swing upon an axis extending transversely of the axis of the pivot, and means for pivotally movino said pivot to vary the plane of the ban Wheel carried by said pivot with relation to the plane of the other band wheel.

7. A band saw having, in combination, a frame, two band wheels carried by said frame, a saw carried by said wheels, a carriage\on which said frame is pivotally supported, a shaft axially alined with the pivotal center of said frame, a pulley on said shaft, a pulley having a driving connection with one of the band wheels, a belt connection between said pulleys, a drive-shaft axially alined with the other shaft and connected to rotate therewith, and means for rotating the drive shaft.

8. A band saw having, in combination, a table, a band wheel below the table, a band wheel above the table, a frame carrying said wheels, a saw carried by said wheels, and two saw guides, one above and the other below the table, said guides being arranged to deflect the saw out of its normal plane, a member vertically movable on said frame, on which member one of said saw uides is located, and .means for steadying said men1- ber in adjusted position comprising an arm fixed to said frame, said member being movable into and out of operative relation to said arm.

9. A band saw having, in combination, a main frame, a carriage inovably supported bv the main frame, a saw-supporting frame tiltably connected to the carriage, a saw carried by said frame, means for com1nunicating motion to the saw` said means including a drive-shaft located on the rear portion of the main frame and mounted in the axis of the tilting movement of the saw-supporting frame, a feed shaft extending longitudinally of the main frame, means connecting the drive-shaft to the rear end of the feed shaft, a winding shaft at the forward end of the main frame. winding drums on the winding shaftv` cables connected to the carriage and to said drums, and means connecting the forward end of the feed shaft to the winding shaft.

10. A band saw having, in combination, a main frame, a carriage movably supported by the main frame, a saw-supporting frame, a friction drum connected to the saw frame, a clamp on the carriage to receive and hold the friction drum, a saw carried by the saw frame, means for communicating motion to the saw, said means including a drive-shaft located in the axis of the friction drum, and carriagofeeding means driven by said shaft.

In testimony whereof, I hereunto set my hand.

GEORGE J. BLUM. 

